package cn.vaefun.mapper;import cn.vaefun.pojo.Category;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;import java.util.List;public interface CategoryMapper {@Insert(" insert into category_ ( name ) values (#{name}) ")public int add(Category category);@Delete("delete from category_ where id=#{id}")public void delete(int id);@Select("select * from category_ where id= #{id} ")public Category get(int id);@Update("update category_ set name=#{name} where id=#{id}")public int update(Category category);@Select(" select * from category_ ")public List<Category> list();
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><typeAliases><package name="cn.vaefun.pojo"/><!--    扫描该包下的类使得在后续配置文件pojo.xml中使用resultType的时候，可以直接使用Category,而不必写全cn.vaefun.pojo.Category--></typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/vaefun_mybatis?characterEncoding=UTF-8"/><property name="username" value="root"/><property name="password" value="root"/></dataSource></environment></environments><mappers><mapper resource="cn/vaefun/pojo/pojo.xml"/><mapper resource="cn/vaefun/pojo/Product.xml"/><mapper resource="cn/vaefun/pojo/Order.xml"/><mapper resource="cn/vaefun/pojo/OrderItem.xml"/><mapper class="cn.vaefun.mapper.CategoryMapper"/></mappers>
</configuration>

package cn.vaefun.test;import cn.vaefun.mapper.CategoryMapper;
import cn.vaefun.pojo.Category;
import cn.vaefun.pojo.Order;
import cn.vaefun.pojo.OrderItem;
import cn.vaefun.pojo.Product;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class TestMybatis {public static void main(String[] args) throws IOException {String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession session=sqlSessionFactory.openSession();CategoryMapper mapper = session.getMapper(CategoryMapper.class);//insertCategory(session);//deleteCategory(session);//getCategory(session);//updateCategory(session);//listAll(session);//listCategoryByName(session);//listCategoryByIdAndName(session);//listCategory(session);//listProductNTo1(session);//addOrederItem(session);//deleteOrderItem(session);//listOrder(session);//updateProduct(session);//listAllProduct(session);//listProductByName(session);//addCategory(mapper);//deleteCategory(mapper);updateCategory(mapper);session.commit();session.close();}/*** 显示所有* @param session*/public static void listAll(SqlSession session){List<Category> cs=session.selectList("listCategory2");for (Category c : cs) {System.out.println(c.getId()+"t"+c.getName());}//        List<Product> products=session.selectList("listProduct");
//        for (Product p : products) {
//            System.out.println(p.getId());
//            System.out.println(p.getName());
//            System.out.println(p.getPrice());
//        }}/*** 添加* @param session*/public static void insertCategory(SqlSession session){Category c = new Category();c.setName("这是insert的Category");c.setId(5);session.insert("addCategory",c);}/*** 删除* @param session*/public static void deleteCategory(SqlSession session){Category c = new Category();c.setId(5);session.delete("deleteCategory",c);}/*** 查找* @param session*/public static void getCategory(SqlSession session){Category c = session.selectOne("getCategory",3);System.out.println(c.getName()+c.getId());}/*** 修改* @param session*/public static void updateCategory(SqlSession session){Category c = session.selectOne("getCategory",4);c.setName("修改过的Category");session.update("updateCategory",c);}/*** 模糊查找：%cat%* @param session*/public static void listCategoryByName(SqlSession session){List<Category> categoryList = session.selectList("listCategoryByName","cat");for (Category c :categoryList) {System.out.println(c.getName());}}/*** 多条件查询* @param session*/public static void listCategoryByIdAndName(SqlSession session){Map map = new HashMap();map.put("id",1);map.put("name","cat");List<Category> categoryList = session.selectList("listCategoryByIdAndName",map);for (Category c :categoryList) {System.out.println(c.getId()+"t"+c.getName());}}/*** 一对多*/public static void listCategory(SqlSession session){List<Category> cs = session.selectList("listCategoryP");for (Category c : cs) {System.out.println(c);List<Product> ps = c.getProducts();for (Product p : ps) {System.out.println("t"+p);}}}/*** 多对一查询* @param session*/public static void listProductNTo1(SqlSession session){List<Product> productList = session.selectList("listProductNTo1");for (Product p :productList) {System.out.println(p+"对应的分类是t"+p.getCategory());}}/*** 多对多查询* @param session*/public static void listOrder(SqlSession session){List<Order> orders = session.selectList("listOrder");for (Order order : orders) {System.out.println(order.getCode());List<OrderItem> orderItems = order.getOrderItems();for (OrderItem orderItem : orderItems) {System.out.format("t%st%ft%d%n",orderItem.getProduct().getName(),orderItem.getProduct().getPrice(),orderItem.getNumber());}}}/*** 添加一个OrderItem* @param session*/public static void addOrederItem(SqlSession session){Order order = session.selectOne("getOrder",1);Product product = session.selectOne("getProduct",6);OrderItem orderItem = new OrderItem();orderItem.setProduct(product);orderItem.setOrder(order);orderItem.setNumber(109);session.insert("addOrderItem",orderItem);}/*** 删除OrderItem* @param session*/public static void deleteOrderItem(SqlSession session){Order order = session.selectOne("getOrder",1);Product product = session.selectOne("getProduct",6);OrderItem orderItem = new OrderItem();orderItem.setOrder(order);orderItem.setProduct(product);session.delete("deleteOrderItem",orderItem);}/*** 查询所有的Product* @param session*/public static void listAllProduct(SqlSession session){List<Product> products = session.selectList("listAllProduct");System.out.println("查询所有的");for (Product p :products) {System.out.println(p);}}/*** 模糊查找* @param session*/public static void listProductByName(SqlSession session){Map<String,Object> map = new HashMap<>();map.put("name","a");map.put("price",80);List<Product> products = session.selectList("listAllProduct",map);System.out.println("模糊查找");for (Product p :products) {System.out.println(p);}}/*** 更新商品* @param session*/public static void updateProduct(SqlSession session){Product product = session.selectOne("getProduct",3);//System.out.println(product);product.setName("product d");product.setPrice((float) 99.99);//System.out.println(product);session.update("updateProduct",product);}/*** 添加一个Category* @param mapper*/private static void addCategory(CategoryMapper mapper){Category category = new Category();category.setName("新增的Category");mapper.add(category);listCategory(mapper);}/*** 删除一个Category* @param mapper*/private static void deleteCategory(CategoryMapper mapper){mapper.delete(4);listCategory(mapper);}/*** 修改category* @param mapper*/private static void updateCategory(CategoryMapper mapper){Category category = mapper.get(3);category.setName("修改过的Category");mapper.update(category);listCategory(mapper);}/*** 显示所有的Category* @param mapper*/private static void listCategory(CategoryMapper mapper){List<Category> categoryList = mapper.list();for (Category c :categoryList) {System.out.println(c.getId()+"t"+c.getName());}}
}